JPH0415550B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette, and more particularly to a tape cassette suitable for magnetic recording and reproducing devices such as video tape recorders, audio tape recorders, and data recorders.

PRIOR ART In general, a tape cassette used in a magnetic recording/reproducing device equipped with a tape loading mechanism that pulls out a magnetic tape from an attached tape cassette and loads it into a predetermined path has an opening into which a reel shaft is inserted. and a notch into which a tape pull-out member is fitted, at a position facing the front side across which the magnetic tape traverses. In recent years, tape cassettes have become smaller and recording of information signals on magnetic tapes has become more dense, so it has become essential that magnetic tapes are clean and free of dust. The tape cassette must have a dust-proofing effect that prevents dust from entering the tape cassette.
However, tape cassettes with openings and notches as described above have insufficient dust-proofing effects because dust can easily enter through the openings and notches during storage (when not in use). The problem was that it was unsuitable for high-density applications.

Although storing the tape cassette in a case is effective for dustproofing, it is a hassle to remove the tape cassette from the case when the tape cassette is attached to a recording/playback device, and then to put it back in the case after use. requires both hands and is not convenient to use.

Means for Solving the Problems Therefore, the present invention provides a dustproof effect by preventing the opening into which the magnetic tape winding drive mechanism of the device is inserted when it is installed in a magnetic recording/reproducing device from being exposed when not in use. The purpose of the present invention is to provide a tape cassette which solves the above-mentioned problems, and its structure is such that a supply side magnetic tape winding body 5 and a winding side magnetic tape winding body 6 are rotatably supported. , tape guides 8a, 8b, 9a, 9 that guide the magnetic tapes 7, 47 from the supply side magnetic tape roll 5 through the tape path near the front surface to the take-up side magnetic tape roll 6.
b, 46c, and tape pull-out members 16a, 1 of the recording/reproducing device extending from near the front to behind the tape path.
6b, 49 are inserted into the notches 10, 46b;
Magnetic tape winding body drive mechanism 35a of recording/reproducing device
a sliding body 3, 45 provided with first openings 18a, 18b into which the sliders 3, 45 are inserted, and a lid body 2B that slidably holds the sliding bodies 3, 45 and is provided in the front opening so as to be openable and closable. , 42 and second openings 17a, 17b into which the magnetic tape roll drive mechanism 35a is inserted, but does not have a cutout into which the tape drawer members 16a, 16b, 49 are inserted. When not in use, the sliding bodies 3, 45 are stored in the closed cassette housings 2, 41, and the first openings 18a, 18b and the second Opening hole 17a, 1
The positions of holes 7b are different and the openings 17a and 17 on both sides are different.
b, 18a, 18b are closed, and when in use, when attached to a recording/reproducing device, the sliding bodies 3, 45 slide forward from the closed cassette casings 2, 41, and the openings 17a of both are closed. ，
17b, 18a, and 18b are aligned, the magnetic tape roll drive mechanism 35a is inserted, and the notch 1
0, 46 are exposed and the tape pull-out members 16a, 16
b, 49 are inserted.

Embodiment First, an embodiment of the tape cassette according to the present invention will be schematically described with reference to FIGS. 1A to 1C and FIGS. 2A and 2B. 1A to 1C show the state of the tape cassette 1 when not in use,
Figures 2A and 2B show the state during use.

As shown in FIGS. 1A to 1C, a tape cassette 1 includes a roughly box-shaped cassette housing 2 and a sliding body 3 housed within the cassette housing 2 so as to be slidable in the direction of arrow _X1 . It becomes more.

The cassette casing 2 includes a casing 2A consisting of a bottom plate, a top plate, both side plates, and a back plate, and a lid which is provided in the casing 2A so as to be openable and closable, and which is normally closed to close the rectangular opening on the front of the casing 2A. It consists of body 2B.

The sliding body 3 has a supply side magnetic tape winding body 5 and a winding side magnetic tape winding body 6 juxtaposed on a substrate 4,
In addition, tape guide poles 8a, 8b and tape guide rollers 9 guide the magnetic tape 7 on the left and right sides.
This is a configuration in which a and 9b are provided. On the board 4,
A notch 10 is formed between the tape guide rollers 9a and 9b into which a tape pull-out member is fitted.

When not in use, as shown in Figures 1A to C,
The sliding body 3 is slid to the maximum in the direction of arrow _X2 and is completely housed within the cassette housing 2, and the notch 10 is covered by the bottom plate of the housing 2A. Reel shaft insertion hole 17 as a second opening in the bottom plate of the housing 2A
a, 17b and the reel shaft insertion holes 18a, 18b as the first openings of the substrate 4 are completely misaligned, and the reel shaft insertion holes 17a, 17b of the bottom plate are closed by the substrate 4. Moreover, the lid body 2B is closed. The cassette casing 2 becomes a sealed casing with no opening when the cassette 2B is closed.
This intrusion of dust into the interior is effectively prevented, and the magnetic tape 7 is better protected from dust adhesion. That is, the tape cassette 1 has excellent dustproof properties.

The tape cassette 1 is loaded into a magnetic recording/reproducing apparatus in the state shown in FIGS. 2A and 2B. That is, during the installation process, the lid 2B rotates about 90 degrees about the axis 2Bb and opens, and in conjunction with the opening operation of the lid 2B, the sliding body ₃ slides a predetermined distance in the direction of arrow The notch 10 is partially pulled out from the cassette case 2A.
Exposed to the outside and reel shaft insertion hole 1 of the board 4
8a and 18b are the reel shaft insertion holes 17 of the housing 2A.
Matches a, 17b. In the tape cassette 1, the left and right positioning holes 12a, 12b of the substrate 4 fit into the positioning pins 13a, 13b, and the left and right positioning holes 14a, 14b on the back side of the casing 2A fit into the positioning pins 15a, 15b. Then, both the slider 3 and the cassette housing 2 are positioned and installed, and the tape pull-out members 16a and 16b are relatively fitted into the notch 10 and the tape guide roller 9
It faces the inside of the magnetic tape 7 between a and 9b. After that, the tape pulling members 16a and 16b move to perform a tape loading operation, and the magnetic tape 7
is pulled out, loaded onto a predetermined path, and travels along the path to perform magnetic recording and reproduction.

Furthermore, when the tape cassette 1 starts to be ejected from the recording and reproducing apparatus after recording and reproducing, the lid body 2B closes during the ejecting process, and in conjunction with this, the sliding body 3
slides in the direction of arrow _X2 and is pushed back into the housing 2A. As a result, the tape cassette 1 has the sliding body 3 completely attached to the housing 2, as shown in FIGS.
A, the lid 2B is closed, the reel shaft insertion holes 17a and 17b are closed by the substrate 4, and the reel is discharged in a dust-proof state.

Next, the tape cassette 1 having the above structure will be explained in more detail with reference to FIG. 3 and subsequent figures. In each figure, the same reference numerals are given to the parts that substantially correspond to the constituent parts shown in FIGS. 1A to C and FIGS. 2A and B.

3 to 5 and 8 show the tape cassette 1 when it is not in use, and FIGS. 6, 7, and 9 show it when it is in use.

As shown in FIG. 5, the housing 2A of the cassette housings 2 has a structure in which an upper half 20 and a lower half 21 are stacked vertically and fixed.

The upper half 20 has the shape shown in FIGS. 10A and 10B, and has ribs 20b on the lower surface of the top plate 20a, which does not have an opening, for smooth sliding of the sliding body 3.
20c and 20d are formed.

The lower half 21 has the shape shown in FIGS. 11A, B, and C, and the bottom plate 21a has no cutout for fitting the tape pull-out member, and only the reel shaft fitting holes 17a and 17b are drilled. It has been set up. These holes 17a, 17b are formed at positions closer to the front side of the center so that they are closed by the sliding body 3 when not in use, as will be described later. Further, on the upper surface of the bottom plate 21a, ribs 21b, 21c, and 21d support the sliding body 3 so that it can slide smoothly, and on the lower surface, ribs 21b, 21c, and 21d prevent the tape cassette 1 from being inserted into the device in the wrong direction. A groove 21e for preventing erroneous insertion is formed.

Further, the lower half 21 is formed with an arm portion 21f extending toward the rear surface from the front edge of the bottom plate 21a, and guide ribs 21g and 21h protruding from the left and right side walls. As will be described later, these work together to guide the sliding movement of the sliding body 3 and to regulate the position of the sliding body 3 in the height direction. Further, in the left and right side walls of the lower half 21, elongated openings 21i and 21j are formed adjacent to and at the same height as the guide ribs 21g and 21h.

The above-mentioned upper and lower halves 20 and 21 are combined together with the lid body 2B, and are fixed with screws at two places on the left and right on the back side and at one place in the center on the front opening 22 side.

As shown in FIGS. 3, 4, and 8, the lid body 2B is rotated in the directions of arrows A ₁ and A ₂ by fitting the shafts 2Ba and 2Bb on both sides into the recesses 21k and 21 of the lower half 21. It is movable, and usually the
As shown in the figure, the front opening 22 is covered. In addition, the lid body 2B is equipped with fan-shaped gears 2Bc and 2Bd on the left and right sides.
It has integrally. In association with the fan-shaped gears 2Bc and 2Bd, the upper half 20 is formed with notches 20e and 20f that allow the lid 2B to be opened.

As shown in FIG. 5, the sliding body 3 is shown in FIG.
This structure includes reel hubs 24, 25, etc. between the top plate (lower slide plate) 4 shown in FIG. 1 and the top plate (upper slide plate) 23 shown in FIG.

The board 4 and the top plate 23 are assembled by overlapping each other as shown in FIG.
a to 4d fit into the openings 23a- ₁ to 23d- ₁ of the hanging ribs 23a to 23d of the top plate 23, and are fixed with vertical spacing determined by the hanging ribs 23a to 23d.

The board 4 and the top plate 23 have a reel shaft insertion hole 1.
8a, 18b, 23e, and 23f are formed correspondingly. - The reel hub 24 is rotatably provided by fitting the upper and lower ends into the annular grooves 4e, 23g, etc. of the base plate 4 and the top plate 23, and facing the reel shaft insertion holes 18a, 23e. reel hub 25
The upper and lower ends are connected to the annular groove 4 of the substrate 4 and the top plate 23.
f, 23h, and reel shaft insertion hole 18.
b, 23f, and is rotatably provided.

In addition, a notch 1 is provided on the front surface of the board 4 and the top plate 23.
0 and 23i are formed.

The base plate 4 also has racks 4i, 4j and 12 racks shown in FIG. 12B that mesh with the fan-shaped gears 2Bc and 2Bd, as shown in FIG. Pole 4k, 4 shown in Figure C
, and hollow columnar tape guide poles 8a and 8b shown in FIG. 12D are formed. The hollow portions of these tape guide poles 8a, 8b function as positioning holes 12a, 12b. Paul 4k, 4
The collars 26a and 26b are rotatably provided. Further, as shown in FIG. 12A, a plurality of ribs 4m are formed on the upper surface of the substrate 4, extending in the vertical direction and diagonally crossing directions. Rib 4m
As shown in FIG. 12A, a high rib portion 4 m- ₁ with a large protruding height (shown with satin finish in FIG. 12A),
It consists of a low rib part with a small protruding height of 4m- ₂ .

Additionally, there are third
As shown in FIG. 5, a cocoon-shaped liner 27,
28 are engaged, and the lower liner 28 is supported in a distributed manner by the high rib portion 4m- ₁ and the brake member 29. As shown in FIG. 5, the periphery of the upper liner 27 has an upwardly curled portion 27a, and the periphery of the lower liner 28 has a downwardly curled portion 28a. As a result, during recording and reproduction, which will be described later, the magnetic tape 7 is guided by the curled portions 27a, 28a at its upper and lower side edges (widthwise side edges), and the liners 27, 2
8, the tape runs smoothly.

The magnetic tape windings 5 and 6 are connected to the reel hub 2, respectively.
4 and 25, the upper and lower sides are supported by liners 27 and 28.

As shown in FIGS. 3 and 5, the brake member 29 is a resin molded member consisting of a rod-shaped portion 29a and V-shaped arm portions 29b and 29c on both ends of the rod-shaped portion _29a . V-shaped arm portions 29b and 29c are installed in a flat space 33 between the reel hub 24 and the liner 28 so as to face the reel hubs 24 and 25, respectively.

Further, lock members 30a,
30b is attached.

Next, the state of the tape cassette 1 having the above structure when not in use and the operation thereof when in use will be explained with particular reference to FIGS. 3 to 9.

When not in use, the lid body 2B is closed, the front opening 22 is closed, and the sliding body 3 is in the innermost part (storage position) of the housing 2A, as shown in FIGS. 3 to 5. It is completely housed within the housing 2A. The cutout portion 10 is covered by a non-cutout portion on the front side of the bottom plate 21a of the lower half 21. Board 4
The reel shaft insertion holes 18a and 18b of the lower half 2
Reel shaft insertion hole 17a, 17 of bottom plate 21a of 1
The holes 17a and 17b are completely offset from each other by being biased toward the back of the casing 2A with respect to the substrate 4. Further, annular dustproof members 31a and 31b are provided around the holes 17a and 17b. Furthermore, the elongated openings 21i, 21j are connected to the claw portions 30a- ₁ , 30 of the locking members 30a, 30b.
Blocked by b- ₁ .

As a result, the tape cassette 1 can be opened at the front opening 2.
It has a dust-proof structure that sufficiently restricts the intrusion of dust through the notch 2, the notch 10, the reel shaft insertion holes 17a and 17b, and the elongated openings 21i and 21j. 7 is sufficiently protected from dust and the like.

Further, the claw portions 30a- ₁ and 30b- ₁ are connected to the elongated opening 2.
1i, 21j, and the slider 3 is locked against the cassette housing 2 so that it cannot slide. As shown in FIG. 8, the racks 4i and 4j of the base plate 4 of the sliding body 3 are provided with fan-shaped gears 2Bc and 2 of the lid body 2B.
Bd are engaged, and the lid body 2B is also indirectly locked in the closed position. Therefore, during handling,
The inconvenience that the lid body 2B opens unnecessarily and the dustproof performance is impaired does not occur.

Further, the reel hubs 24 and 25 are both braked by being pressed by the arm portions 29b and 29c of the brake member 29. Furthermore, the sliding body 3 is secured to the left and right sides of the substrate 4 by the guide ribs 21g, 21h, so that rattling in the height direction within the cassette housing 2 is restricted.

In addition, the protrusions 20g, 2 of the upper and lower halves 20, 21
1 m are brought together to form a pole 32. This pole 32 also prevents the notch 10 from loosening even if the magnetic tape 7 along the front surface of the notch 10 is loosened.
As a fence to restrict entering into 0,
It also functions as a reinforcing column to prevent the front opening 22 side of the cassette housing 2, which is forcibly weak, from being crushed.

The above-mentioned tape cassette 1 is inserted into a cassette holder (not shown) of a magnetic recording/reproducing apparatus with the lid 2B facing forward, and moves together with the cassette holder to reach a cassette mounting position where it is mounted.

In the process of moving to the cassette mounting position, first, as shown in FIG.
a, 34b are the elongated openings 21i of the cassette housing 2,
Enter 21j. As a result, the lock member 3
0a, 30b are elastically deformed, and the claw portions 30a- ₁ , 3
0b- ₁ comes out of the openings 21i, 21j, the sliding body 3 is unlocked from the cassette housing 2, and the indirect lock of the lid 2B is also released, making it possible to open the lid. Next, the lid body 2B is rotated approximately 90 degrees in the direction of arrow _A1 by a lid opening mechanism (not shown) to open the seventh
Open as shown. When the lid body 2B rotates in the opening direction, the fan-shaped gears 2Bc, 2
Bd, racks 4i and 4j, the slider 3 is driven on both left and right sides in the direction of arrow _X1 and moves in the same direction relative to the cassette housing 2. That is, the sliding body 3
slides a predetermined stroke L in the direction of arrow _X1 in conjunction with the opening operation of the lid body 2B, and the front portion comes out from the opened opening 22. Note that the sliding body 3 is driven on both the left and right sides to guide the left and right ends of the substrate 4 through the guide ribs 21.
The ribs 21b to 21 are guided by g and 21h.
d, and the sliding body 3 slides smoothly.

As a result, in the tape cassette 1, as shown in FIGS. 6 and 7, a part of the sliding body 3 is pulled out from the housing 2A, and the notches 10 and 23i and the positioning holes 12a and 12b are exposed. , the reel shaft insertion holes 18a and 18b are the reel shaft insertion holes 17, respectively.
a and 17b and are exposed. The tape cassette 1 reaches the mounting position in this state, and the reel hubs 24 and 25 are inserted into the matching holes 17a and 18a.
and reel hubs 24, 2 through 17b, 18b.
Reel shafts 35a and 35b that relatively enter into 5
and the tape pull-out members 16a and 16b relatively enter into the notches 10 and 23i, and furthermore, the sliding body 3 has its positioning holes 12a and 12b fitted with the positioning pins 13a and 13b, and Housing 2
A is fitted into the positioning holes 14a, 14b and the positioning pins 15a, 15b, so that they are mounted in a state where their positions are regulated relative to each other in the directions of arrows _X1 and _X2 . Note that the sliding body 3 connects the substrate 4 at three locations with guide ribs 21.
g, 21h and the arm portion 21f, and the height direction relative to the housing 2A is also regulated.

Furthermore, in connection with the above-mentioned sliding of the sliding body 3, the brake member 29 is moved by the rod-shaped portion 2 as shown in FIG.
9a is locked at the center by the arm portion 21f, and the left and right sides thereof are held by high ribs 4m- ₁ . integral locking protrusion 4n,
4o and elastically curves, the arm portion 29
b, 29c are separated from the reel hubs 24, 25.
As a result, the reel hubs 24 and 25 are released from braking.

In this state, as described above, the tape rotating operation is performed by the tape pull-out members 16a and 16b, and then magnetic recording and reproduction are performed.
The tape winding bodies 5 and 6 are connected to upper and lower liners 27 and 28.
It rotates stably while sliding against the lower liner 2.
8 and is supported and formed.

Further, in the process of ejecting the tape cassette 1 from the recording/reproducing apparatus, the lid body 2B rotates in the _two directions of arrow A and closes, and the sliding body 3 interlocks with this and slides in _{the two} directions of arrow X to close the casing. It is stored in the body 2A. The tape cassette 1 is ejected from the cassette holder in its original state as shown in FIGS. 3 to 5. Note that the brake member 29 bent as shown in FIG.
It also acts to push back into the housing 2A,
The sliding movement of the sliding body 3 becomes smooth.

Next, another embodiment of the tape cassette of the present invention will be described with reference to FIGS. 15A and 15B and FIGS. 16A and 16B.

In this tape cassette 40, a lid body 42 rotatably provided on the front side of a casing 41 is biased in the lid opening direction by a torsion coil spring 43, and a fan engagement gear integrated with the lid body 42 is applied. 44 is engaged with a rack 46a on the base plate 46 of the slider 45.

When the lid body 42 is closed, FIG. 15A,
As shown in B, the entire sliding body 45 is housed within the housing 41. That is, the notch 46b on the front side of the board 46 is covered by the bottom plate 41a of the housing 41 and is not exposed. In addition, a tape guide 4 that guides the magnetic tape 47 faces the notch 46b.
6c is a rib structure having an arcuate tip.

As shown in FIGS. 16A and 16B, the lid body 42 is locked by the lid opening member 48 and rotates to open the lid, and in conjunction with this, the sliding body 45 slides and partially opens the housing 41. The notch 46b is exposed and faces the tape pull-out member 49.

Further, the lid body 42 is closed by the spring force of the spring 43, and in conjunction with this, the sliding body 45 is pushed back and housed in the housing 41.

Effects As described above, according to the tape cassette of the present invention, when not in use, the second opening and the first opening of the casing into which the magnetic tape winding body drive mechanism is inserted are closed. For example, when stored, dust is reliably prevented from entering the tape cassette through the openings, and has excellent dustproof properties, preventing external dust etc. from adhering to the internal magnetic tape. This makes it ideal for devices that avoid dust adhesion, such as high-density magnetic recording and reproducing devices, and when in use, the second aperture and the first aperture are open, allowing the magnetic tape winding drive mechanism to fit. It can be used normally.

Furthermore, since the notch into which the tape pull-out member fits is not exposed when not in use, the intrusion of dust through the cut-out is also restricted, and the magnetic tape winding drive mechanism and tape pull-out member can be fitted into each other when used. This type of tape cassette has the advantage of being able to realize a tape cassette with excellent dustproof properties when not in use.

[Brief explanation of drawings]

1A is a plan view schematically showing the state of the tape cassette of the present invention when not in use, FIG. 1B is a side view, and FIG. 1C is a cross-sectional view taken along the line C-IC in FIG. 1A. A perspective view, FIG. 2A is a plan view schematically showing the state in which the tape cassette of FIG. 1A is used, FIG. 2B
2A is a cross-sectional view taken along line B-B in FIG. 4 is a partial plan view, FIG. 5 is a sectional view taken along the line - in FIG. 3, FIG. 6 is a plan view showing the tape cassette in FIG. 3 in use, and FIG. Figure 6 is a cross-sectional view taken along the line in Figure 6, Figure 8 is a cross-sectional view taken along the line in Figure 4, showing the relationship between the sector gear of the lid and the rack, and Figure 9 is when the tape cassette is used. Figure 1 corresponds to Figure 8 in
Figures 0A and B are a plan view and side view of the upper half of the housing, Figure 11A is a plan view of the lower half of the housing, and Figure 11A is a plan view of the lower half of the housing.
1B and 1C are cross-sectional views taken along lines XB-XB and XC-XC in FIG. 11A, respectively, showing the shape of each part of the lower half; FIG. 12A is a plan view of the substrate of the sliding body; Figure 12A is a plan view of the substrate of the sliding body, and Figures 12B, C, D, and E show the shapes of each part of the substrate, respectively, XB-XB and XC-X in Figure 12A.
C, a cross-sectional view taken along lines XD-XD and XE-XE, FIG. 13 is a plan view of the top plate of the sliding body, and FIG. 14 is an elevational view showing the substrate and top plate of the sliding body facing each other. Fig. 15 A, B, and Fig. 16 A, B
FIG. 2 is a partial plan view and a longitudinal sectional side view showing another embodiment of the tape cassette of the present invention when not in use and when in use, respectively. 1, 40...Tape cassette, 2...Cassette housing, 2Bc, 2Bd, 44...Sector gear, 2A,
41... Housing, 2B, 42... Lid, 3, 45...
...Sliding body, 4,46...Substrate (lower slide plate),
4i, 4j, 46a... rack, 5... supply side magnetic tape winding body, 6... winding magnetic tape winding body,
7, 47... Magnetic tape, 8a, 8b... Tape guide pole, 9a, 9b... Tape guide roller, 10, 46b... Notch, 16a, 16b,
49... Tape pull-out member, 17a, 17b... Reel shaft insertion hole (second opening) of the housing, 18c,
18d...Reel shaft insertion hole of the board (second opening), 20...Upper half, 21...Lower half, 2
1a...Bottom plate, 22...Front opening, 23...Top plate (upper slide plate), 24, 25...Reel hub,
35a, 35b...Reel shaft, 46c...Tape guide.

Claims (1)

[Scope of Claims] 1. A magnetic tape winding body 5 on the supply side and a winding magnetic tape winding body 6 on the winding side are rotatably supported, and the magnetic tapes 7, 47 from the magnetic tape winding body 5 on the supply side are placed in front. The magnetic tape winding body 6 on the winding side passes through the nearby tape path.
tape guides 8a, 8b, 9a, 9 that guide the
b, 46c, and tape pull-out members 16a, 1 of the recording/reproducing device extending from near the front to behind the tape path.
6b, 49 are inserted into the notches 10, 46b;
Magnetic tape winding body drive mechanism 35a of recording/reproducing device
a sliding body 3, 45 provided with first openings 18a, 18b into which the sliders 3, 45 are inserted, and a lid body 2B that slidably holds the sliding bodies 3, 45 and is provided in the front opening so as to be openable and closable. , 42 and second openings 17a, 17b into which the magnetic tape roll drive mechanism 35a is inserted, but does not have a cutout into which the tape pull-out members 16a, 16b, 49 are inserted. When not in use, the sliding bodies 3, 45 are stored in the closed cassette housings 2, 41, and the first openings 18a, 18b and the second Opening hole 17a, 1
The positions of holes 7b are different and the openings 17a and 17 on both sides are different.
b, 18a, 18b are closed, and when in use, when attached to the recording/reproducing device, the sliding bodies 3, 45 slide forward from the closed cassette casings 2, 41, and open the openings 17a of both. ，
17b, 18a, and 18b are aligned, the magnetic tape roll drive mechanism 35a is inserted, and the notch 1
0, 46b are exposed and the tape pull-out members 16a, 16
A tape cassette characterized in that b, 49 is inserted.